Track-Blaster Error?

[SuperBrian]

1. I have made a terrain field with a track (The track contains no finish).
2. I have made a track on an empty terrain (grass only).
3. When I select the first track in TB and switch to comparative mode the other track looks like the first one, and otherwise.

For instance I can press + or - to see other tracks which looks different, but the two I want to put on top of each other looks similar, even though they aren't similar when I check them in the game.

Also, when it finally works, how do I mix them together? I can't see the option in the menu.

Brian/newbie in Track Blaster..